Lance Cpl. Anthony Acosta fires a M240B machine gun during live-fire training on April 24, 2012 aboard USS Pearl Harbor here. The 22-year-old Phoenix native serves as a mortarman for Battalion Landing Team 3/1, the ground combat element for the 11th Marine Expeditionary Unit. The unit is deployed as part of the Makin Island Amphibious Ready Group, currently a US Central Command theater reserve force. The group is providing support for maritime security operations and theater security cooperation efforts in the US Navy's 5th Fleet area of responsibility. Photo by Cpl. Tommy Huynh.